Regular form over swindle catching mark (7)
I believe the answer is:
octagon
This could be a double definition.
'regular form' is the first definition.
(I've seen this before)
'swindle catching mark' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'over' acts as a link.
Can you help me to learn more?
(Other definitions for octagon that I've seen before include "Eight-sided shape" , "Geometric figure with eight sides" , "Eight-sided object" , "Shape of a square with the corners cut off" , "Figure with 8 sides" .)